Yes! Once you set up your family members in your Apple ID account for Family Sharing all of your subscriptions across Iconfactory apps such as Triode, Linea and Iconfactory Tapestry can be shared freely among them.
 

For more details about how to set up Family Sharing, see: https://support.apple.com/en-us/HT201088

Please keep in mind, Family Sharing is all under Apple's magic blackbox. If there is any issues with Family Sharing not working, please contact Apple to resolve this matter. We just check the checkbox to offer said function.